不是应该想要推翻的放原假设么

NO.PZ2015120604000148

问题如下：

Here is a table discribing sample statistics from two bonds' rate of return which are both normally distributed over the past decades. If an investor is considering whether the variance of bond A is equal to the variance of bond B,

which of the following conclusion is least appropriate (significant level=5%) ?

选项：

It is appropriate to use the $χ^{2}$ test.

It is appropriate to use the F-test.

C.The null hypothesis is:H₀ : σ1 ² =σ2²

解释：

A is correct.

The F-test is appropriate to the equality of two independent normally distributed population variances. $χ^{2}$ test is appropriate to test whether a variance from a normally distributed population is equal to a certain value.

根据题干内容C是对的么

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1 个答案

星星_品职助教 · 2022年10月27日

同学你好，

当检验“=”和“≠”时，原则永远是将等号放在原假设。

只有检验大于或小于关系时，才需要考虑“想要推翻的放原假设”

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NO.PZ2015120604000148问题如下Here is a table scribing sample statistifrom two bon' rate of return whiare both normally stributeover the past cas. If investor is consiring whether the varianof bonA is equto the varianof bonB,whiof the following conclusion is least appropriate (significant level=5%) ?A.It is appropriate to use the χ2 test.B.It is appropriate to use the F-test.C.The null hypothesis is:H0 : σ1 2 =σ2 2 A is correct.The F-test is appropriate to the equality of two inpennt normally stributepopulation variances.χ2 test is appropriate to test whether a varianfrom a normally stributepopulation is equto a certain value. 不是应该用F分布吗？

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老师怎么看出和两个 inpennt的

2020-02-22 15:12 1 · 回答

本题想检验方差A是否等于方差B，那原假设不应该是方差A不等于方差B吗？C应该也是错的啊

2019-08-01 16:30 1 · 回答

C应该也是错的啊，为什么C不选

2019-03-28 21:11 1 · 回答

不是应该想要推翻的放原假设么

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